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id="html与css学习第五天"><a href="#html与css学习第五天" class="header-anchor">#</a> HTML与CSS学习第五天</h1> <p><img src="https://img-blog.csdnimg.cn/166c14cb546044d1b2f7f8a7063a61d4.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <p>@<a href="%E7%9B%AE%E5%BD%95">TOC</a></p> <h2 id="_1-pxcook的基本使用"><a href="#_1-pxcook的基本使用" class="header-anchor">#</a> 1. PxCook的基本使用</h2> <ol><li>通过软件打开设计图
<ol><li>打开软件</li> <li>拖入设计图</li> <li>新建项目</li></ol></li> <li>常用快捷键
<ul><li>放大设计图：crtl + +号</li> <li>缩小设计图：ctrl + - 号</li> <li>移动设计图：空格按住不放，鼠标拖动</li></ul></li> <li>常用工具
<ul><li>量尺寸</li> <li>吸颜色</li></ul></li> <li>从psd文件中直接获取数据
<ul><li>切换到开发模式，直接点击获取数据</li></ul></li></ol> <h2 id="_2-盒子模型"><a href="#_2-盒子模型" class="header-anchor">#</a> 2. 盒子模型</h2> <h3 id="_2-1-盒子模型的介绍"><a href="#_2-1-盒子模型的介绍" class="header-anchor">#</a> 2.1 盒子模型的介绍</h3> <h4 id="_2-1-1-盒子的概念"><a href="#_2-1-1-盒子的概念" class="header-anchor">#</a> 2.1.1 盒子的概念</h4> <ul><li>页面中的<strong>每一个标签，都可以看作成一个“盒子”,通过盒子的视角布局页面</strong></li> <li>浏览器渲染页面时，会将网页元素（标签）看出一个个矩形区域，我们形象的称其为盒子</li></ul> <h4 id="_2-1-2-盒子模型"><a href="#_2-1-2-盒子模型" class="header-anchor">#</a> 2.1.2 盒子模型</h4> <ul><li><p>CSS规定每个盒子分别由：<strong>内容区域（content），内边距区域（padding），边框区域（border），外边距区域（margin）构成</strong>，这就是盒子模型。</p></li> <li><p>图解</p></li></ul> <p><img src="https://img-blog.csdnimg.cn/758a38be03334dc4a0de264145990fed.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzM5MzgyMzQ=,size_18,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="盒子模型"></p> <h3 id="_2-2-盒子模型内容的高度和宽度-width-height"><a href="#_2-2-盒子模型内容的高度和宽度-width-height" class="header-anchor">#</a> 2.2 盒子模型内容的高度和宽度（width，height）</h3> <ul><li>width属性设置宽度</li> <li>height属性设置高度</li> <li>常见取值：数字+px</li></ul> <h5 id="注意点"><a href="#注意点" class="header-anchor">#</a> 注意点</h5> <ul><li>width和height属性是设置盒子内容区域的宽度和高度</li></ul> <p><img src="https://img-blog.csdnimg.cn/229c33a2c571452b8aa4c1151e179ee1.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzM5MzgyMzQ=,size_13,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="盒子内容区域"></p> <h3 id="_2-3-盒子的边框-border"><a href="#_2-3-盒子的边框-border" class="header-anchor">#</a> 2.3 盒子的边框-border</h3> <ul><li><p>设置边框粗细，边框样式，边框样式效果</p></li> <li><p>单个属性</p> <table><thead><tr><th>作用</th> <th>属性名</th> <th>属性值</th></tr></thead> <tbody><tr><td>边框粗细</td> <td>border-width</td> <td>数字+px</td></tr> <tr><td>边框样式</td> <td>border-style</td> <td>实线：solid，点线：dotted，虚线：dashed</td></tr> <tr><td>边框颜色</td> <td>border-color</td> <td>颜色取值</td></tr></tbody></table></li></ul> <h4 id="_2-3-2-边框的连写模式"><a href="#_2-3-2-边框的连写模式" class="header-anchor">#</a> 2.3.2 边框的连写模式</h4> <ul><li><p>属性名：border</p></li> <li><p>属性值： 单个取值的连写，取值之间</p></li> <li><p>示例</p></li></ul> <div class="language-html line-numbers-mode"><pre class="language-html"><code>border:10px solid red;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>快捷键：bd+回车/tab；</li></ul> <h4 id="_2-3-3-边框-单方向设置"><a href="#_2-3-3-边框-单方向设置" class="header-anchor">#</a> 2.3.3 边框-单方向设置</h4> <ul><li>场景：只给盒子的某个方向设置边框</li> <li>属性名：border-方位词</li> <li>属性值：连写的取值</li> <li>示例</li></ul> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>viewport<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>width=device-width, initial-scale=1.0<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>X-UA-Compatible<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>ie=edge<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
    <span class="token selector">div</span>
    <span class="token punctuation">{</span>
        <span class="token property">width</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
        <span class="token property">height</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
        <span class="token property">background-color</span><span class="token punctuation">:</span> red<span class="token punctuation">;</span>
        <span class="token comment">/* 边框粗细 */</span>
        <span class="token property">border-width</span><span class="token punctuation">:</span> 10px<span class="token punctuation">;</span>

        <span class="token comment">/* 边框样式  solid dashed dotted 实线 虚线 点线*/</span>
        <span class="token property">border-style</span><span class="token punctuation">:</span> dotted<span class="token punctuation">;</span>
        <span class="token comment">/* 边框颜色 */</span>
        <span class="token property">border-color</span><span class="token punctuation">:</span> blue<span class="token punctuation">;</span>

        <span class="token comment">/* border属性连写 */</span>
        <span class="token property">border</span><span class="token punctuation">:</span> 10px solid blue<span class="token punctuation">;</span>

        <span class="token comment">/* 3.单方向设置边框 */</span>
        <span class="token property">border-top</span><span class="token punctuation">:</span> 10px dotted green<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>
        我是dasb
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/9417ede2a65048eb9ccb13f919220ecd.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzM5MzgyMzQ=,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="效果图"></p> <h3 id="_2-4-盒子的内边距-padding"><a href="#_2-4-盒子的内边距-padding" class="header-anchor">#</a> 2.4 盒子的内边距-padding</h3> <ul><li><p>定义：设置边框与内容区域之间的距离</p></li> <li><p>属性名：padding</p></li> <li><p>常见取值：</p> <table><thead><tr><th>取值</th> <th>示例</th> <th>含义</th></tr></thead> <tbody><tr><td>一个值</td> <td>padding:10px;</td> <td>上下左右都设置为10px</td></tr> <tr><td>两个值</td> <td>padding:10px 20px;</td> <td>上下设置为10px，左右设置为20px</td></tr> <tr><td>三个值</td> <td>padding:10px 20px 30px;</td> <td>上设置为10px，左右设置为20px，下设置为30px</td></tr> <tr><td>四个值</td> <td>padding:10px 20px 30px 40px;</td> <td>上设置为10px，右设置为20px，下设置为30px，左设置为40px</td></tr></tbody></table></li> <li><p><strong>记忆规则：从上开始赋值，然后顺时针赋值，如果没有设置赋值的，看对面的是多少就是多少。</strong></p></li></ul> <h4 id="_2-4-2-内边距单方向设置"><a href="#_2-4-2-内边距单方向设置" class="header-anchor">#</a> 2.4.2 内边距单方向设置</h4> <ul><li>只给盒子的某个方向单独设置内边距</li> <li>属性名：padding-方位名词</li> <li>属性值：数字+px</li></ul> <h4 id="案例"><a href="#案例" class="header-anchor">#</a> 案例</h4> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>viewport<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>width=device-width, initial-scale=1.0<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>X-UA-Compatible<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>ie=edge<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
    
    <span class="token comment">/* padding属性 */</span>
    <span class="token selector">div</span>
    <span class="token punctuation">{</span>
        <span class="token property">width</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
        <span class="token property">height</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
        <span class="token property">background-color</span><span class="token punctuation">:</span> red<span class="token punctuation">;</span>
        <span class="token comment">/* 一个值 上下左右都为10px*/</span>
        <span class="token comment">/* padding: 10px; */</span>
        <span class="token comment">/* 两个值  上下为10px 左右为20px*/</span>
        <span class="token comment">/* padding: 10px 20px; */</span>
        <span class="token comment">/* 三个值 上为10px 左右为 20px 下为 30px */</span>
        <span class="token comment">/* padding: 10px 20px 30px; */</span>
        <span class="token comment">/* 四个取值：10px 20px 30px 40px  上为10px 右为20px 下为30px 左为 40px 顺时针*/</span>
        <span class="token comment">/* padding: 10px 20px 30px 40px; */</span>


        <span class="token comment">/* padding的单方向赋值 */</span>
        <span class="token property">padding-top</span><span class="token punctuation">:</span> 10px<span class="token punctuation">;</span>

        
    <span class="token punctuation">}</span>


    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>
        我是大傻逼
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/2574a82ea7a84664a7888546e7931578.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzM5MzgyMzQ=,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="padding区域"></p> <h3 id="_2-5-盒子实际大小的计算"><a href="#_2-5-盒子实际大小的计算" class="header-anchor">#</a> 2.5 盒子实际大小的计算</h3> <ul><li><strong>盒子宽度=左边框+左padding+内容宽度+右padding+右边框</strong></li> <li><strong>盒子高度=上边框+上padding+内容高度+下padding+下边框</strong></li></ul> <h6 id="注意点-2"><a href="#注意点-2" class="header-anchor">#</a> 注意点</h6> <ul><li><strong>盒子的大小会被padding和border撑大，设置的width和height是内容区域大小，不是盒子实际大小</strong></li> <li>图解</li></ul> <p><img src="https://img-blog.csdnimg.cn/4f382ad96b2b488cb0304bffde921464.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzM5MzgyMzQ=,size_18,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="盒子实际大小"></p> <h3 id="_2-6-不会撑大盒子的特殊情况-块级元素"><a href="#_2-6-不会撑大盒子的特殊情况-块级元素" class="header-anchor">#</a> 2.6 不会撑大盒子的特殊情况（块级元素）</h3> <ul><li>如果<strong>子盒子没有设置宽度，宽度默认为父盒子的宽度</strong></li> <li>此时给子盒子设置左右padding和左右border，此时不会撑大子盒子</li></ul> <h3 id="_2-7-盒子的自动内减和手动内减"><a href="#_2-7-盒子的自动内减和手动内减" class="header-anchor">#</a> 2.7 盒子的自动内减和手动内减</h3> <ul><li>原因：盒子会被padding和border撑大，要想得到固定大小的盒子，需要计算出width和height</li> <li><strong>手动内减：自己计算多余大小，在内容区域减去</strong></li> <li><strong>自动内减：</strong> <ul><li>给盒子设置属性box-sizing:border-box;即可</li> <li>浏览器自动计算多余大小，自动在内容中减去</li></ul></li></ul> <h3 id="_2-8-盒子的外边距-margin"><a href="#_2-8-盒子的外边距-margin" class="header-anchor">#</a> 2.8 盒子的外边距-margin</h3> <ul><li><p>设置边框以外，盒子与盒子之间的距离</p></li> <li><p>属性名：margin</p></li> <li><p>常见取值</p> <table><thead><tr><th>取值</th> <th>示例</th> <th>含义</th></tr></thead> <tbody><tr><td>一个值</td> <td>margin:10px;</td> <td>上下左右都设置为10px</td></tr> <tr><td>两个值</td> <td>margin:10px 20px;</td> <td>上下设置为10px，左右设置为20px</td></tr> <tr><td>三个值</td> <td>margin:10px 20px 30px;</td> <td>上设置为10px，左右设置为20px，下设置为30px</td></tr> <tr><td>四个值</td> <td>margin:10px 20px 30px 40px;</td> <td>上设置为10px，右设置为20px，下设置为30px，左设置为40px</td></tr></tbody></table></li></ul> <h4 id="_2-8-2-外边距单方向设置"><a href="#_2-8-2-外边距单方向设置" class="header-anchor">#</a> 2.8.2 外边距单方向设置</h4> <ul><li>只给盒子的某个方向设置外边距</li> <li>属性名：margin-方位名词</li> <li>属性值：数字+px</li></ul> <h4 id="_2-8-3-margin单方向设置的应用"><a href="#_2-8-3-margin单方向设置的应用" class="header-anchor">#</a> 2.8.3 margin单方向设置的应用</h4> <table><thead><tr><th>方向</th> <th>属性</th> <th>效果</th></tr></thead> <tbody><tr><td>水平方向</td> <td>margin-left</td> <td>让当前盒子向右移动</td></tr> <tr><td>水平方向</td> <td>margin-right</td> <td>让右边的盒子向右移动</td></tr> <tr><td>垂直方向</td> <td>margin-top</td> <td>让当前盒子向下移动</td></tr> <tr><td>垂直方向</td> <td>margin-bottom</td> <td>让下面的盒子向上移动</td></tr></tbody></table> <h3 id="_2-9-清除默认边距"><a href="#_2-9-清除默认边距" class="header-anchor">#</a> 2.9 清除默认边距</h3> <ul><li>浏览器会默认给部分标签设置默认的margin和padding，为了实现精准布局，需要消除这些margin和padding</li> <li>解决方法</li></ul> <div class="language-heml line-numbers-mode"><pre class="language-text"><code>*{
	margin:0;
	padding:0;
}
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-10-外边距折叠现象-1合并现象"><a href="#_2-10-外边距折叠现象-1合并现象" class="header-anchor">#</a> 2.10 外边距折叠现象-1合并现象</h3> <ul><li>垂直布局的块级元素，上下margin会合并</li> <li>结果：<strong>盒子上下间距为两者margin的最大值</strong></li> <li>解决方法：只给其中一个盒子设置margin</li></ul> <h3 id="_2-11-外边距折叠现象-2塌陷现象"><a href="#_2-11-外边距折叠现象-2塌陷现象" class="header-anchor">#</a> 2.11 外边距折叠现象-2塌陷现象</h3> <ul><li>场景：<strong>互相嵌套的块级元素，子元素的margin-top会作用在父元素上</strong></li> <li>结果：导致父元素一起向下移动</li> <li>解决方法
<ul><li>给父元素设置border-top或者padding-top(分隔父子元素的margin-top)</li> <li><strong>给父元素设置overflow:hidden</strong></li> <li>转换成行内块元素（bfc触发）</li> <li><strong>设置浮动</strong></li></ul></li></ul> <h3 id="_2-12-行内元素的margin和padding无效情况"><a href="#_2-12-行内元素的margin和padding无效情况" class="header-anchor">#</a> 2.12 行内元素的margin和padding无效情况</h3> <ul><li>水平方向的margin和padding有效</li> <li><strong>垂直方向的margin和padding无效</strong></li></ul></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/linxin1123/vuepress-blog/edit/master/docs/01.前端/41.HTML笔记/05.HTML与CSS学习第5天.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2023/02/17, 11:29:32</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/pages/024faa/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">HTML与CSS学习第4天</div></a> <a href="/pages/3744f7/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">HTML与CSS学习第6天</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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